Closterium incurvum is a freshwater green algae belonging to the desmid group. It has elongated, crescent-shaped cells with a thin cellulose cell wall. Each cell contains ribbon-like chloroplasts with pyrenoids for starch storage and is involved in photosynthesis. Reproduction primarily occurs through binary fission, and under specific conditions, sexual reproduction via conjugation can also take place. Closterium incurvum commonly inhabits ponds, lakes, and slow-moving streams, where it attaches to submerged vegetation or sediment. It plays a crucial role as a primary producer in freshwater ecosystems, contributing to nutrient cycling and supporting aquatic life.